loadbyqueue.js

function loadByqueue(list,type,callback){
  var queue = [],
  _load = {
    "sync":function(list){
        var src = list[0];
        if(!src) callback();
        $.getScript(src,function(){
           list.shift();
          _load["sync"](list);
         });
     },
    "asyn":function(list){
         var list = list.reverse(),len = list.length;
             queue.length = len;
         while(len--){
            var src = list[len];
            (function(i){
            $.getScript(src,function(){
                queue[i] = true;
                for(var k=0;k<queue.length;k++){
                    if(!queue[k]) break;
                    if(queue[k] && k === queue.length) callback();
                }
            });
            })(len);
         }
     }
  }
  _load[type](list);
}
loadByqueue(["1.js","2.js","3.js"],"asyn",function(){
   console.log("all loaded");
});